Siekoya Remolino, Ecuador – A conservation effort is underway to locate one of the planet’s most elusive primates. Nicolás Schuldt Durán of Neblina Labs began the work earlier this year after members of the Siekopai Indigenous community reached out for support. The project pairs long-standing local knowledge with passive acoustic monitoring to map the presence of pygmy marmosets, also known locally as leoncillo. ([1])
The Scale of the Search
Pygmy marmosets rank among the smallest primates on Earth. Adults weigh roughly 140 to 150 grams, comparable to a small apple, and spend most of their time high in the forest canopy. Their calls include high-pitched whistles that often fall into the ultrasonic range, making them difficult to detect through conventional observation alone. The species is classified as vulnerable, with habitat loss from deforestation and capture for the illegal pet trade adding pressure across the western Amazon Basin.
Community-Led Monitoring in Practice
The Siekopai people already maintain camera traps and a territorial program aimed at deterring illegal hunting and logging. Durán described the acoustic component as an additional instrument rather than a replacement for existing efforts. Community members contribute detailed understanding of local terrain, seasonal movements, and call patterns that help guide where monitors should be placed. This integration allows the team to cover more ground efficiently while respecting established stewardship practices.
Technology and Traditional Knowledge Combined
Passive acoustic devices record sound continuously across wide areas without requiring constant human presence. Analysts later review the recordings for the distinctive vocal signatures of pygmy marmosets. The approach reduces disturbance to the animals and provides data that can be cross-checked against observations shared by community monitors. Durán noted that the method simply expands the toolkit already in use for biodiversity tracking in the region.
Next Steps for the Project
The search continues, with no confirmed detections reported so far. Ongoing work focuses on refining monitor placement and analyzing collected audio to build a clearer picture of the species’ distribution. The collaboration illustrates how Indigenous stewardship and modern tools can operate together to address conservation needs in remote Amazonian territories.
